This kit includes a 1/2 gallon air tank and a heavy-duty air compressor, suitable for high-pressure air horns that need an on-board air system. The air tank is made of durable steel that can withstand outdoor use, while the compact design makes it easy to handle. Both the air tank and compressor are ready for installation, and the package includes a 1/4" air hose, fittings, air gauge, 90/110 PSI air pressure switch, hardware, and installation instructions.